Helena Valley Regulating Reservoir Weather Forecast

    • 33
    • 61

    Chance Rain Showers

    • 37
    • 63

    Partly Sunny

    • 38
    • 63

    Chance Rain Showers

    • 41
    • 68

    Chance Rain Showers

    • 41
    • 68

    Rain Showers Likely

    • 44
    • 69

    Chance Rain Showers

Today 20 May Helena Valley

Mostly cloudy. A 40 percent chance of rain Showers in the afternoon. Highs around 60. West Winds 10 to 20 Mph.

Tonight 20 May Helena Valley

Mostly clear. Lows in the mid 30s. Northwest Winds 10 to 15 Mph with Gusts to around 30 Mph shifting to the southwest after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Helena Valley Regulating Reservoir Temperature Statistics

May Temperature

Helena Regional Airport (5.6 miles)

  • Lowest 6 May, 2025

    34.6 °F

  • Average May

    56.1 °F

  • Highest 10 May, 2025

    88.6 °F

Climate (2020–Present)

Helena Regional Airport (5.6 miles)

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  • Average Low 2020–2025

    36.1 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.3 °F
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